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250 Class Electric Helicopters 250 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


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Old 06-04-2015, 10:02 AM   #61 (permalink)
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Quote:
Originally Posted by myxiplx View Post
The DS76t in particular is lightweight and extremely fast.
But at the cost of having very little torque. (I think they just geared it up.) Fantastic that that little guy is working for you. Mine definitely needs a big heavy DS95i.
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Old 06-03-2016, 12:06 PM   #62 (permalink)
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After reading Number's thread and a few others I found new inspiration in my little 250. I just put the 100th flight on her yesterday. I have a bone stock 250plus dfc except it has fiberglass align canopy on it. I've been reading through these threads about the weight difference in parts etc. so I wanted to jump on that band wagon. Out of curiosity I Just now weighed in at 275g. From what I've been reading sub 300g is where you want to be and I'm getting this weight stock with the heavy fiberglass canopy. Are you guys all trying to be sub 300g with the flight battery or just the heli?
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Old 06-03-2016, 12:09 PM   #63 (permalink)
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We're getting the total flying weight under 300g, you're probably running in the 340g range at the moment.
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Old 06-03-2016, 01:20 PM   #64 (permalink)
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I'm 270g all up with battery and no canopy. Flies sweet like this and crashes like a feather so far lol.
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Old 06-03-2016, 01:37 PM   #65 (permalink)
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Ok, roger that! Yes, with battery I'm at 348g. Time to diet folks. Food for thought. I have the torque tube model and was thinking of converting to carbon boom and belt drive. I know the boom is lighter but I wonder what is the difference between torque tube and parts needed vs. belt and parts needed? Which version is lighter? Also I'm looking to run some high hs like Number is. The torque tube gear box on this model makes me worry. It caused my only crash at 6 flights in. Was just flying around and the gears spun on the shaft causing me to loose the tail. It did this 3 times but the other 2 times I almost crashed. When I bought new little gears I CA'd them from new. I've only ran about 85% since because I'm not sure how strong they are.
Few questions:
1. Is belt more durable and perhaps less vibration (smoother running) on this model? Additionally I see where an infinity kevlar belt is recommended by Number, supposed to be the shizzle.
2. Which set-up is lighter TT or belt both using carbon boom?
3. If I'm missing something please fill in. I'm trying to obtain best performance, smoothest running, and durability.
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Old 06-03-2016, 02:01 PM   #66 (permalink)
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I think the belt is lighter, but I'm not 100% sure. What I can say is that I'm a huge fan of the belt, 370+ flights on my 250 and that belt hasn't skipped a beat. It flies great, has survived numerous tail impacts, and has even survived me snapping the carbon boom in two.

I've replaced the belt 3 times after crashes, but haven't ever had to touch the tail gears, it's totally maintenance free.
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Old 06-04-2016, 02:45 AM   #67 (permalink)
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shannimal you can drop at least 10g by changing the fiberglass canopy for the plastic one.
The carbon boom is marginal about 1g if that in difference to the aluminium one.
As for the weight of TT vs Belt I donít know, I use the TT and love it no issues with it and I am running 4700rpm in IU2.
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Old 06-04-2016, 03:48 AM   #68 (permalink)
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Thx guys. I'm so stoked on this heli all of the sudden lol. Don't know why. Thinking Number is to blame after seeing him rip lol. I could easily get caught up in all sort of conversations about this and that. Since this thread has to do with weights of items I'll not derail and stick to that subject. Maybe even contribute if I find something worth sharing. Few of you about to get PM's lol!!!
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Old 06-05-2016, 08:22 PM   #69 (permalink)
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Has anyone here tried these on the cyclics?
BlueArrow Servos
D05180MG
http://www.hawk-creation.com/index.p...roduct_id=4232

Do they fit in the Trex 250 frame?

@ 6 Grams each, it would be a worthy servo.
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Old 06-05-2016, 08:55 PM   #70 (permalink)
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They won't fit without adapters. I have heard that they are the same as the lynx ones though.

I had thought about getting the lynx ones and making new frame sides to fit them. They would be great for a super light build.
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Old 06-05-2016, 09:31 PM   #71 (permalink)
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thank you
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Old 09-27-2016, 12:24 PM   #72 (permalink)
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This thread hasn't been posted to for a few months, but I just noticed the discussion about tt vs. belt. I weighed mine before and after the conversion and if memory serves, converting to belt shaved about 12g off my AUW.

I'm not sure on that number (it has been a long time) but it was definitely lighter after the conversion.
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Old 09-27-2016, 12:55 PM   #73 (permalink)
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Nice info, added to the spreadsheet :-)
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Old 01-24-2017, 02:51 PM   #74 (permalink)
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not much action here in a while...

i just weight my copterx meets trex 250 dfc and its a shocking 365g with nanotech 850mah battery.

granted i did paint the canopy with probably far to many layers of paint.

what are we doing to get to 300g. I think i can get close with the 7.5g servos , i dont crash often but guarenteed ill strip a servo by the sounds of it.

currently i have turnigy tgy-213c servos on the cyclic which have survived 3 crashes now, 2 of them bad.

turnigy 306-hv on the tail .

These are heavy, 16g for cyclic and 21g for tail. theres i think a 25.5g weight saving just by changing the cyclics and 13.5 with the tail. for a total of 39g saving.

That would get me down to 326g.

Im already running a 3g satalite instead of a full RX. and a bar with the top half of the case removed.

How much weight saving is there with a plastic canopy??

Also i want to change to a talon 15 ESC which will save at a guess maybe 5g.

Im not sure what the copterx motor weighs.

My 250 does feel quite heavy in the air. Im not quite at 100% on the esc ill get about 5 minutes doing mild flying with some very mild 3d (just flips and rolls). With 13 degrees pitch feel im using more collective because of the weight.

running 15 tooth pinion at the moment so also considering going to 16t.

Cant see anywhere else to shave of weight.
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Old 01-24-2017, 03:26 PM   #75 (permalink)
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The servos, talon (especially with direct soldered wires), hobbyking skids, and no canopy make a huge difference.
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Old 01-24-2017, 03:27 PM   #76 (permalink)
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A talon 15 with short wires is incredibly light (mine is under the battery tray), and pay attention to the battery connector too.
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Old 01-24-2017, 03:34 PM   #77 (permalink)
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So the servos are ok despite the very low torque?? They cost the same as the turnigy servos so not too expensive. But they are alot faster it seems.

plastic canopy is a definate.

I like the align skids too much, they raise the heli higher off the ground which makes it easier in longer grass.
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Old 01-24-2017, 03:37 PM   #78 (permalink)
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Quote:
Originally Posted by bazsound View Post
Cant see anywhere else to shave of weight.
Servos and ESC first. Canopy and then you are down to diminishing returns.
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